.relative(@left: 0, @top: 0) {
    position: relative;
    left: @left;
    top: @top;
}
.absolute(@left: 0, @top: 0) {
    position: absolute;
    left: @left;
    top: @top;
}

.toBlock(@width:0px, @height: 0px) {
    display:block;
    width:@width;
    height: @height;
}

.center(@top: 0) {
    margin: @top auto;
}

.flexCenter(@direction:row){
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
}    